深大基坑开挖对邻近地铁车站影响研究

On Deformation Influence of Deep Excavation Adjacent to Subway Station

在运营地铁车站周边进行基坑开挖,无疑会对车站结构的变形产生影响.为确保邻近地铁车站的正常运营,运用PLAXIS软件建立平面数值分析模型模拟实际基坑开挖过程,研究了世博轴深大基坑工程开挖对邻近耀华路地铁车站水平、竖直及总变形的影响,并分析了不同基坑连续墙位移下运营车站的变形情况.计算结果表明,在基坑开挖过程中,运营车站竖向隆起量先增加后减少,而水平变形不断增加.运营车站竖向、水平变形的最大值均与基坑连续墙侧向变形最大值呈线性关系.

When excavation projects are built adjacent to the subway, it will have some effects on the station. To insure the normal function of the adjacent station, excavation construction is simulated by PLAXIS program. This paper studies the displacement of the Yaohua Road station caused by the excavation of deep and large foundation pit of Shanghai Expo axis and analyzes the station deformation under different displacement of underground diaphragm wall. The results show that during the excavation, the heave value of adjacent station increases at first and then decreases, and its horizontal displacement keeps increasing. The maximum horizontal and vertical displacement of adjacent station has linear relation with the maximum horizontal displacement of diaphragm wall.